add: поле updated_at (Дата обновления) в модели +миграции, админке, блогах, страницах и sitemaps.xml

etpgrf_site/blog/admin.py

@@ -1,17 +1,20 @@
 from django.contrib import admin
+from django.utils.html import format_html
+import html
 from .models import Post
 
 @admin.register(Post)
 class PostAdmin(admin.ModelAdmin):
-    list_display = ('title', 'post_type', 'is_published', 'published_at')
+    list_display = ('clean_title', 'post_type', 'is_published', 'published_at', 'updated_at')
     list_filter = ('post_type', 'is_published', 'published_at')
     search_fields = ('title', 'content', 'slug')
     prepopulated_fields = {'slug': ('title',)} 
     date_hierarchy = 'published_at'
+    readonly_fields = ('updated_at',)
     
     fieldsets = (
         (None, {
-            'fields': ('title', 'slug', 'post_type', 'is_published', 'published_at')
+            'fields': ('title', 'slug', 'post_type', 'is_published', 'published_at', 'updated_at')
         }),
         ('Контент', {
             'fields': ('image', 'excerpt', 'content')
@@ -21,3 +24,8 @@ class PostAdmin(admin.ModelAdmin):
             'classes': ('collapse',)
         }),
     )
+
+    @admin.display(description='Заголовок', ordering='title')
+    def clean_title(self, obj):
+        """Отображает заголовок без HTML-сущностей (  -> пробел)."""
+        return html.unescape(obj.title)